Naturalisation in Extra-Tropical Countries. 383 



by overfeeding. P. julifera lias not found favor in India. In some 

 places these kinds of plants are subjects to the attacks of boring 

 insects. 



Prosopis pubescens, Bentham. 



The Tornillo or Screw-bean. Texas, California, Mexico. The 

 pods ripen at all seasons and contain much saccharine nutritive 

 substance [J. S. Gamble]. Likely available for hedges with other 

 species of other countries. Seeds can be converted into food [Sar- 

 gent]. Not resisting climatic vicissitudes so well as P. dulcis. 



Prosopis spicigrera, Linne. 



India, extending to Persia. A thorny tree, also producing edible 

 pods and enduring some frost. It attains a height of 60 feet, but 

 is of slow growth [Brandis]. Serves for hedge-lines. It can be 

 chosen for desert-land [Kurz]. 



Prosopis Steplianiana, Kunth. 



Syria, Persia, Afghanistan. A shrubby species of hedge-growth. 

 Galls, common on the pods, are collected for dye- and tan-purposes 

 [Dr. Aitchison]. 



Frostanthera lasiantha, Labillardiere. 



South-Eastern Australia and Tasmania. Confined to the banks 

 of forest-streams. The only one among more than 2,500 Labiate, 

 which becomes a good-sized tree, reaching a height of fully 60 feet. 

 Wood useful for many technologic purposes. The leaves of this 

 and its many congeners afford, on distillation, aromatic oils. Most 

 of the species of this Australian genus are pleasantly and strongly 

 odorous ; among them particularly so the tall, shrubby P. rotundi- 

 folia (B. Brown), P. melissifolia (F. v. M.), P. cuneata (Bentham), 

 the latter hardy alpine, so that an aromatic oil can be distilled 

 payably from them. These plants should prove valuable on Apiary- 

 grounds also. 



Protea mellifera, Thunberg. 



South-Africa. This tall bush is deserving a place among the 

 plants of this work, not only in view of its gaudy ornamental 

 aspect, but also on account of the richdom of honey-nectar in its 

 large inflorescence. 



Prunus Americana, Marshall. (P. nigra, Aiton.) 



Canada, Eastern United States of America. A thorny tree, 

 furnishing the Yellow and Red Plum of North- America. Hardy in 

 Norway northward to lat. 65 [Schuebeler]. The fruit is roundish 

 and rather small, but of pleasant taste. All kinds of Prunus are 

 important to the apiary. 



